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Fuel Cost Calculator

Trip fuel expenses and consumption

By Guga — BrowserTools maintainer, Tbilisi, Georgia Updated 2026-09-12
Free Private No uploads

This is an estimate from figures you type, not a quote or a route planner. It ignores traffic, gradients, load, weather, vehicle condition, towing, idling and real-world driving variation, and it does not know fuel prices. Treat the output as a planning range, and check current prices and consumption figures for your actual vehicle before budgeting.

What is Fuel Cost Calculator?

Four fields: distance, unit system, the vehicle's efficiency figure, and the current pump price. Switching the unit selector changes how the efficiency number is read — in metric it is litres per 100 kilometres, so a 400 kilometre trip in a car rated 7.5 uses 30 litres; in imperial it is miles per gallon, so the same trip described as 400 miles in a car doing 30 mpg uses 13.3 gallons. Either way you get the fuel needed, the trip cost, and the running cost per kilometre or per mile, which is the number worth remembering: it is what you can compare across vehicles and what a long journey actually costs. It is arithmetic on figures you supply. It does not know your car, your route, your driving style or today's price at the pump.

Estimate the fuel cost of any trip from distance, fuel efficiency and gas price — in metric or imperial units. Compare vehicles and plan travel budgets in seconds.

Private Fuel Cost Calculator In Your Browser

Fuel Cost Calculator is processed locally with client-side JavaScript. Your files never touch a server, and there is no queue to wait in.

Step-by-Step

How to use Fuel Cost Calculator

1

Enter the trip distance in kilometres or miles as appropriate.

2

Choose the unit system, then type the efficiency figure in the convention that system uses — L/100km or MPG.

3

Enter the fuel price per litre or per gallon.

4

Read the fuel needed for the trip, the total cost, and the running cost per unit distance.

Key Capabilities
  • The unit selector switches the consumption convention, because L/100km and MPG are inverse measures and entering one where the other is expected silently produces a wrong answer.
  • Metric consumption is expressed as litres per 100 km, so lower is better, while imperial MPG works the opposite way.
  • Running cost per kilometre or mile is reported alongside the trip total, so the figure is reusable for a different distance.
  • Zero or negative values for any field suppress the results rather than printing an infinite or meaningless cost.
Common Use Cases
  • A driver planning a 600 kilometre road trip budgets fuel from the pump price and the car's published consumption.
  • A car buyer comparing two vehicles works out a running cost per mile for each before deciding.
  • A delivery dispatcher estimates the fuel cost of a multi-stop route for a single leg.
Clear Answers

Frequently Asked Questions

Why did my first number look absurd before I switched units?
The efficiency field means different things in each mode. Entering 30 where litres per 100 km is expected treats 30 litres per 100 km as an extremely efficient car. Set the selector to match how your figure is quoted.
Is a figure like 7.5 L/100km the same as 30 mpg?
Roughly, yes — around 33 mpg in practice. The two systems measure consumption in opposite directions, which is exactly why mixing them up is so easy.
Does this account for motorway versus city driving?
No. You supply a single consumption figure, so use a number that matches how you actually drive. Real trips land somewhere between the city and motorway figures.
Can it find the cheapest fuel nearby?
No. It makes no network requests and has no fuel price data. Look up today's local price and enter it.